Voolutrafo

Voolutrafo is a term found in limited sources to describe a device that combines the functions of a transformer with a voltmeter. It is not a standard term in mainstream electrical engineering, and references to a voolutrafo typically appear in educational materials, hobbyist projects, or speculative fiction. In these contexts, a voolutrafo is envisioned as a compact instrument that both transforms voltage levels and provides a measurement of electrical potential on its output or input.

A typical design includes a magnetic core with primary and secondary windings to provide voltage transformation, plus an internal or attached sensing circuit that measures voltage and, in some cases, current. The measurement may be derived from the secondary voltage, scaled to a readable range, or from a separate sensing circuit that monitors the primary current via a shunt or a current transformer. Some designs emphasize galvanic isolation between the measurement electronics and the power path, while others use autotransformer configurations where part of the winding carries both power and sensing signals. The device may be designed for fixed voltage ratios or for adjustable ratios through taps or variable cores.

Operating characteristics and limitations include accuracy depending on winding tolerances, core losses, frequency, and temperature. Because a voolutrafo integrates power transformation with sensing, performance can be sensitive to loading conditions and frequency response. They are mostly of interest for teaching demonstrations and hobbyist experiments rather than professional power distribution, where separate transformers and calibrated meters are standard. Safety considerations involve proper insulation, adequate clearance for high voltages, and appropriate isolation ratings for the measurement circuitry. See also transformer, voltmeter, and autotransformer.